Carburetor



March 9 1926. y 1,576,295

F. H. BALL CARBURET OR Filed March v 191s 2 Sheets-shut 2 ieiented.it/lar. 31,

,1.5763295 rsur OFFICE.

FRANK H. BALL, F DETRIT, lMI(.'lI-IIGrAN., ASSIGNOR, BY MESNEASSIGNMENTS, T0

BLL AND BALL CARBUBETOR ClXMPANY,"0Fl DETROIT, MIGIGA'N, A- PARTNER- S-UGMPOSEB 0F FREDEREGK 0. BALIR'AN'D CORNELIA Miu/:BALL

oennlunnrou.

application mea Marca r, 1ers. Serrara-@ecosse y i l" .To all rhomzzf4may cou/oem.'

Be it known. that I, FRANK H. BALL,a

` citizen of the United States, residing at Detroit, inthecounty oflVayne .and ot' Michigan, have invented new and useful limprovements inCarburetor's, of which the following is a specification. This inventlonrelates to carburetors an consists in certain improvements in theconstruction thereof as will be hereinafter fully described and pointedout in the claims.

The carburetor comprises a primary care buretor adapted to utilize ahigher volatile uel, sueh as gasoline and a, secondary carbui-eter'adapted vto use a less volatile :fuel

such as kerosene. While the primary and secondary carburetors haveadvantages independent'of their association with each other, they are,however, particularly ad-4 vantageous in their construction. inl suchrelation. 4 i

-The combineddevice is designed to utilize gasoline. inthe primarycarburetor for starting 4and slow running when the air velocities areinsuflicient to thoroughly .atolnize kerosene so vas. to make. itreadily available, also "when the exhaust heat 1s 111-,

suiiicient to vaporize kerosene. The primary carburetor is designed tovdeliver the fuel in the form of an emulsion to the point oi? greatestair velocity in said primary can huretorand is so `designed as todeliver a properly proportioned mixture of air and vapor throughout therange ol'v the carburetor while acting independently as n primarycarburetor Without the use of yielding valves.

rlf'he secondary carburetor which is' designed to use kerosene isarranged to automatically come into operation when the requirements aresuoli as to give an air Yvelocity which will suiiciently atomizel{erosene to assure its ready combustion. In this connection it isdesirable to oferV as little resistance to the flow of air as possible[and coiiscuucntly having provided means acting only ivheu conditionsare such as to produce permissible air velocity in the secondarycarluiretor, the apparatus is so designed that this initial .velocity isnot much exceeded in' the more restricted portions oi, said carburetoras the demands fo air through it f crease liu this Way the resistance tothe vis etno time excessive.

tats" The invention is illustrated in the accom- Vpanyiug drawings asfollows zy Fig. l is a section on the lines l-1, 7-7, la-dmud 1"--elb inFig. 4.

Figij@ is a section on `the "line 2-2 in rig. i.' l .60

Fig. 3 is a-side elevation of a partlof the carburetor showing the leverfor holding the yielding valve" of the secondary carburetor closed. eg 4Fig. 4 is a-$fection on the lines 4-4 in G5 Figs. 1 and 2. 'i 4 Fig. 5is a detail View in section on the line 5-5 in Fig. 4. Fig.Y 6 is adetail'view in section on the line 6 6 in Fig. Il. 70 Fig. 7 is a detailvie);T in. section on the line 7-7 in Fig.. 4. y "s l Fig. 8is a, detailView, in section'onl the line 8--8t`in Fig. 2. I

1 marks'the carburetor body, 2 the aso-v 75 line receptacle, or floatchamber, 3 they erosene receptacle` or float chamber, 4 the 4main mixingchamber, or the-combined suction@ passage7 5 an upper {iange to adapt itto heb readily secured to a manifold 0r othir pas- 8G. sage leading toan engine, G a throttle valve, 7 a rock shaft carrying the throttlevalvet 6, and S'the usual lever for operating the throttle valve. -v

The suction passage of the primary ,carburetor .is provided with arestriction in the Jform of a Venturi tube 9. This tube has ascrew-threaded .end 10 which is screwed into a screw-threaded opening 11in the walls of the passage. The lVenturi tube' has a shoulder 12 at itsbottom Which engages an annular shoulder 13 in the su@ tion passage. Anannular enlargement 15 is formed' in the passage between f the shoulder13 `and the screw threads 11 and -95 the Venturi tube 'forms a' closureat the top and bottom of this enlargement forming a chamber or Wellairopenii'igjj`17'` leads from the inlet-passage 14 belowftfe Venturitube to tliis'well`and spray nozzles 100 18 extend from the well intothe Venturi tube, the' outlets 'of the nozzles extending .inwardly fromthe Wall of the Venturi tube f justabove its greatest restriction, thespray nozzles being inclined and the bottoms ot l0 the spray nozzlesextending to a point in the well below the gasoline fuel level (5i-G asestablishedby the lloat chamber.

Fuel is delivered to the well 16 from the floatv chamber 2. This fioatchamber is of4 the usual form having the inlet 19, valve 20 controllingthe inlet, stem 20L extending 'from the valve, collar 21 on the stem,levers 22 engaging the collar and the float 23 operating on the leversin the usual manner to control the valve 2() and thus control the fuellevel in the receptacle. The fuel flows from the receptacle to an outletpassage 24 which terminates in an extension 25. A hol.- loW screw 26extends through this extension and into a passage 27 formed in thevcarburetor ybody 1.

An opening 28 forms a connection between the opening 29 within the screwandthe passage 24. A screw plug 30 is screwed into the upper end of thepas? sage 27. This plug extends into the end of the screw 2G. The screwplug 30 has a passage 31 within it and the plug extends into the passage29 so that'the openingl in the passage 29 makes a continuous passage. Acalibrated plug 32 is screwed into the end of the passage 3l. Radialopenings 35 extend through the wall of the plug 30 forming a means ofcommunication between the passage {Jil-and the passage 27 outside of thescrew plug. An opening 34; eX- tends from the passage 27 into the well16 .and delivers fuel to the well 16. It will be noted that the radialopenings 33 and,

the opening 3a are below the fuel level so that fuel is delivered to thewell 16 by gravity.'

The choke valve 85 is provided at the inlet to the suction passage ofthe primary carburetor. -This is carried by the rock shaft 36 and can beoperated bya lever 36a.

It is desirable to provide means for supplying the engine during idlingwith a very uniform mixture of highly atomized fuel.

This is preferably done by delivering fuel above the throttle and thisis accomplished in this carburetor by taking fuel and air from theconnection 34 leading to the well 16. A. passage-87 is arranged in thebody of the carburetor and connects with the well 34 (see Fig. 5). Avertical passage 38 extends from the passage 37 and is connected by atube 39 with a passage 4.1i in a projection 40 on the wall of thecarburetor body. A nozzle 42 extends from the passage 41 into thesuction passage just above the throttle. The passage Ll1 is plugged b a.screw 43. `When the throttle is closed fruel and air -are drawn upthrough the passages just enumerated and delivered above the throttle.This is sufiicient to maintain the engine while idlingr in'a well knownman.

and reduces the level in the well so that as the ltlnottle is opened,the spray is carried initially through the npzzles. If, however, thethrottle is so.`suddenly opened that this VIn'eliminar'y movementthrough the'idling tube does not take lace,l then there is an initialmovement of) solid liquid through the nozzles immediately' followed bythe spray. Air passes through the openings 1T to the well and'fuelpassesthrough the openings from the fuel receptacle by way of the passages24,28,v 3 2, 31, 33 and 34; to the well. It is well understood that oneof the primary but most difficult problems in carburetor construction isthe mainte nance of a desired relation between the air and fueldelivered to the carburetor. The high velocity throughtlie Venturi tubereduces the pressure in this tube considerably below the pressure abovethe Venturi tube. This reduced pressure induces a very high velocity inthe spray nozzles so that the fuel is atomized. ThisA movement of airthrough the spray nozzles toward the lower pres sure in the Venturi tubereduces the ressure in the Well slightly below atmosplieric pressuresothat the pressure inthe well is intermediate. Nhile the opening 17 isshown comparatively large and is in edect directly open to theatmosphere so that the@ reduction in pressure in the Well lscomparatively slight it will be readily understood that a variation inthis opening will vary the reduction in the Well and conse quently thefuel flow due to this action.

It will further be understoodthat this at- 4niospheric supply ofairthrough'the opening gives a constant and thus reduces thev variableswhich are encountered 1n mauitaining the proportions of fuel and air.

.This in turn induces a: fiow of air through the opening 17 and alsoinduces a flow of fuel through the opening 345 to the Well.

.Inasmuch as the velocityof the air through the well sweeps the fuelfrom this well in the form of a spray through the nozzles a negativehead is avoided in the elevation of this fuel from the fuel level ofthefloat chamber to the upper end of the nozzle because when the fuel issprayed in the form of an emulsion it ceases to have ,an undesirablegravity effect. l

' A In many carburetors, in fact, the greater number of them7 fuel hasbeen delivered in '.liquid state from a nozzle 'into the air current andin order to prevent the overflow from this nozzle whenthe carburetor isnot in use it has been necessary to make the delivery end of this nozzleabove the fuel level. This has. created ywhatqis' usually termed anegative head and` it has been be observed, therefore, that in thisconstruction fuel and air can be delivered in exactly the proportionsydesired throu hout the range of the lcarburetor and throng fixed.orifices. 5 Further that this is accomplished while delivering the fuelto the main air current fully atomized by beiig silbjected to air atvery high velocity .in the spray nozzles.

The choke valve is used in this construction as itis ordinarily used toenrich the mixture, that is, to get a greater amount of suction withagless amount ofl air. It is desirable in order to maintain the properproportions that the flow of air to the well should alsogbe restrictedto ,the same extent that the tlow of-air to the Venturi tube isrestricted and for this reason the openin 17 instead of being made tothe atmosp ere direct is made to the inlet of the suction tube 20 'soas'to be Sulz-ject to the action of the choke valve'. It will, et'course, be understood that in the normal operation of the carburetorwhen running full and the choke valve isl in its normal position, thatis to say, Wide open,

the opening 17 vis practically the same as though it led to theatmosphere.

'The carburetor sofar as describedmay be, upto its capacity',used aloneto advantage `but it is' particularly desirable in connection with asecondary carburetor which 'is designed to use a less volatile fuel,such as kerosene. The successful burning of kerosene depends on completeatomization. This is accomplished in' this carburetor mechanically bysubjecting it to air at high velocity.

It' is desirable, however, to prevent the feeding of kerosene beforethere is a sufficient movement of airthrough the carburetor to supplyavelocity which 'will accomplish this he secondary carburetor is formedin the body 1, apassage 44 being arranged in the body having an axisparallel tothe axis of the passage containing the Venturi tube in.

.6 0 mounting and operates ona seat 49 at the l appel end of thismounting. The valve is carried -by a stern which terminates in ahead 5Iand a spring 52 tensioned between `the head 5l and a part of themounting so |A as -to load the valve and hold it toits scat with apre-determined pressure'. A dash pot. plunger 53 1s carried by the head51 and is provided with the usual minute opening 54.'

' 'lhe plunger operatesiu the chamber 55 00- carried at the bottom ofthe valve mounting and the chamber is closedby a cap 56. 'lhc dash potoperates to prevent violent pulsations of thevalve Vin the usualmanner.`

The opening `to the passage to the valve is restricted by a perforatedplate 57` at the ,not the plug 68 and radial passages 70 oon- "l bottomof the passagel the1 perorations 'in this plate-being lso graduated asto operate with relationto the Vvalve in a manner hereinafter described.The valve mounting has an outer ring 44 and a stein carrying portion atthe center supported by a spider 58, thus permittin a free passageI of:air. through the mounting to the valve. l

The kerosene receptacle, or oat chamber 3 .is of the usual constructionAhaving the inlet 59, Acontrolling valve 60, stem 61 extending -from thevalve, collar 62, levers 63 operating on the collar and a float 64-operating on the levers to controlthe level of fuel in the receptacle,the kerosene level being maintained at the line K-K. Fuel passes fromthe -uel receptacle through the extension 65 to a hollowv screw plug 66by' way of the opening 66. The screw plug passes through the extension65 and into an ai opening 67 in the wall of the carburetor., the screwplug not only forming the connecting passage but also a means ofsecuring the receptacle to the body of the carburetor. A screw plug v68is screwed into the to of theopening 67 and extends down into t ie'opening in the screw 'plug 66. The

screw plug 68.v has an opening 68% A calibrated 'plug 69 is arranged inthe end nect the opening'in the screw plug with an annular chamber 7 1'formed in the passage 67 around the screw ping. "l i chamber 7 isconnected by means of a 5 .esage 752. with a Well 73 formed between theWalls of the valve mounting 46 the passage afl. Spray passages 74 extendfrom the Well 723 andbelow the kerosene level K through the valve seat49. These passages are arranged along the sides of the valve seatadjacent tolthe primary carburetor so that the kerosene may be carriedinto and more thorn oughly :itemized with. the gasoline from the primarycarburetor. Small grooves 75 are cut into the face of the valve s'eat,extendn ing to the edge of the valve seat below the point where thepassages 74: open through Athe valve seat. The'well 73 is connected by anumber of air passages 76`with the sitea tion passage between therestriction formed 35i? by the perforated plate 57 and thc valve 48. Theoperation ot this secondary kerosene carburetor is as followsi The valve48 is so Weighted by the spring 52 that it will -not open by reason ofthe reduced pressure in the chambert until there is a sufficient-reduction of pressure to create a velocity high enough through therestriction formed by the valve vin its initial opening to thoroughly`atomize kerosene. With the initial Tl opening of this valve the greatestrestriction is directly at the valve opening but the openings in theplate 57 also form a restric tion so that the air between the Avalvelthe plate 57 is slightly below atmospheric 3* 'tlie'well und rinduces udow of fuel.

j openingso ere' so large us compared with ,4 "'tli'e is doiuinetellbythe pressure in the churn-` 'lfber betweedthe; vulve und the ,plate5?.

pessegesgid thet'the pressure inthe Well Consequenilly the pressurecontrolling the delivery .of sir und fuel the nel level and the fueliss'wept up and carried through the passages 74: in the form oi s sprs'While thepassuges M "prevent the over' ow"tliey do not 'present a:means of confining the fuel so es to makefe ccnl tinuou'- column offuel negutive heed. The fuel and air being sub A' .jected to the seineinducing pressure there vulve but by reason of the restriction in theplete there is not only :i reduction of 1s e ycorrespondingHow of fueland air to the carburetor.' As the suction increases und therequirements for enfrentar amount of mixture 'ere increased the valve 48opens and there is u.y 'greater flow of air pest the pressure above thevalve but o reduction of pressure below" the vulve' and the velocity ofiair pastthe vulve remeins'or vthis reason more nearly constant.Consequently-there is'the etoiniing effect which is necessary to thevsuccessful use of., kerosene without undue resistnoe tothe .flow ofair. l

In the carburetor of the 'rop-ortionshere shown whenrunning :it fucapacity .of gasoline und of kerosene is utilized. This, of course, canbe varied somewhutto suit the nature of running' but'it will be observedthat in ull slow running Where there is the greatest dit/nity incontrolling the motor, the motor is operating entirely on gasoline undthis is true whether the throttle is entirely open or partially closed,that is t'o say, the position ofi. the throttle does notfin itselcontrolthe time when the seconduryfcerburetor begins to oper-'ate be causeunder some conditions a wide open,

throttle wouldbe accompanied with so slow u ilow of-air as to preventproper utonnzation of kerosene and under these conditlons no kerosenewill be delivered; The primar-y carburetor under such conditions hasnniple capacity for the purpose.

. inf starting the engine, orf under certain conditions; it muy-'bedesirebleto cutout the seconder-y carburetor even. when there is e leighvelocity of sir.' rlliis muy occur with silvery low temperature ofengine'und fuel. lllieve provided :for this by providing meanswherebythe vulve i8 muy he held in closed position. 'iin if? ez'ztendsthrougjgmhtlie well olf the bony the ccriurctor und neil shove 'theplete 5l is;

, from the is substantially the v-scrne. 'It 'will be observed thatthereis nol negative heed' here after the 'initial dif-f l cher e offuelbeceuse the 'well 73 is below 1 und the suction and consequently e.4

on the valve 48. A lever 78 isv pivotllyv v, mounted byl a. stud 79secured to the well of the carburetor. .The .lever 78 hes an arm 8@contacting the push pin 77. The lever 7 8 muy be operated 1n anyconvenient manner 70 dash, .or otherwise to .manually force the closingofA the valve 48 so us to throw out of action the vulve 48..

ln order to supply liquid for the dash pot a. passage 58 is errunggfeddin one of the arms 'of the spider 58 carrying the liquid from the. wellto the chamber 55. A

The utilization of ey primary carburetor of the type# here shown with usecondary carburetor permits oie very compact con `struction because theabsence of usuel parte permits oi vthe convenient assembling of thereceptacles 'with the body of the Vcarburetor passages of the primaryand seconde, 4 carburetor-s with relation to each other. 'lumber thecomplete atomization 'of the gusoliherin connection with the keroseneaires' it' possible to introduce the kerosene e 'slower velocity thanwould otherwise be practical, 'llere is, therefore, a distinct edventagein combining the type of carburetor :Forming the primary and' secondaryele- .ments of. this cerbuietor. a

l. l e'calrburetor, th combination of u Suction passage; a throttlevalve in the'pesv segs; u fuelwell; a fuel feedirur means 'de liver-ing'incl to" the fuel-well from a ccnl' stent iev/el; e spray deviceleading from beI lowI the fuel level in the `fuel well lto the4czupiicity relatively to the spray device to lmaintain sub-atmosphericpressure in the fuel well responsive to and. varyingwith the suctioneffort communicated through the spray passage for inducing a ilow offuel verying as the :suction fellort for induction oi' sir varies in thesuction passage. 2. In a. carburetor,` the combination of a suctionpassage; a throttle valve in lthe passage; a restriction nearer theinlet than the vulve; e fuel Well; a. 'fuel feeding means deliveringfuel to thefuel well. from a constent level; means comprising anobstruc- 12o lowl the fuel level in the fuel. well to the tion varying.the low of air through the restriction und spray devices lcuding'fromberestriction in the suction passage below the throttle und to'abcve thefuel level; and

un nir delivery for the fuel Well having an inlet .more remote `from thedischarge end of the suction passage than the spray devices A and havinge capacity relatively to the spray devises to meistern suontmosphcricissure in the fuel. nell 'resnonsive tu l the suenen coin meansdelivering vin the suction passage.

cated through the spray passage fof' in# ducing a flow of fuel varying.as the4 suction.

'having an inlet more remote from tixediacharge end of the suctionpassage than thev s rag, device and having a capacity relatively to thespray device to maintain subatmospheric pressure in the fuel ,wellresponsive to and varying with the suction effort communicated throughthe spray pesi -sage for inducing a flow of fuel varying Vas the suctioneffort for induction ofair varies 4. In a carburetor, the combination ofa suction passage; a throttle valve iii the pas.

sage; a restriction in the forni of a Venturi tube in the passage nearerthe inlet than the throttle valve; a fuel Well; afuel feeding meansdelivering fuel to fthe fuel vvell from av constant level; a spraydevice leading from below .the fuel level in the fuel 4 .the 'suctionpassage.

Ithe spray well to the suction passage-and to. above the fuel level; andan air delivery for the fuel well having an` inlet more remote from thevdischarge end of the suction passagel than the spray device and havinga capacity relatively to the spray device to maintain sul@ atmosphericsive to and varying with the suction effort communicated through thespray passage for inducing a flow of fuel varying as the suctioneifortfor induction of `air varies in 5. in a carburetor, thecomliiination of a suction passage; a throttle valve in the passage; i,restriction nearer the inlet end of the passage than the throttle valvein the form of a 'Venturi tube; a fuel ivell;a fuel feeding meansdelivering fuel to the fuel Well from a constant level; spray devicesleading from below the fuel lcvQl inthe fiel well and terminating in anozzle e tending from the Wall of the Venturi tube into' the passage;andan air delivery for the fuel well having an inlet more remote fromthe discharge end of the suction passagethan tively to the spray devicesto maintain subatmospheric pressure in the fuel we ll responsive to andvarying with the suction effort communicated through the spray passagefor inducing a flow of fuel varying as the snetioneffort 'for inductionof air varies in the suction j .aisstuga a spray device leadin pressurein the fuel well respon'-` meuns for devices and having a capacityrelamessage llxn a carburetor, the combination ofte suction. passage; athrottle valve in the i sage; a 'fuel well; a fuel feeding m'e'ansrdesliveringfiietto' the fuel Well from a 00nstant leveli a spraying deviceleading from below the fuel level in .the fuel well to:the

suction passage below the throttle and to abve tlie`fuel level; an iairdelivery for the fuel `ivell having an inletanore remote fromIv thedischarge end of the 'suction passage than the spray dev'ie and having'a capacity rela-- -tively to the spray 'device to maintain sub-.atmospheric pressure in the feed Well responsive to and varyingwith-the suction effort communicated through the spray passage forinducing a How of fuel varying as the suction cli'ort for induction ofair varies in the suction passage; und an idling passage leading fromthe well to a point in the suction passage nearer the discharge end thanthe throttle.

7'. In a carburetor, the combination of a- -suction passage; a throttlevalve in said passage; a yielding valve in said passage nearer the inletthan the throttle valve; a

fuel well; means for delivering fuel to said wellfrom a constantlevel;-a spray nozzle leading from the well to the restriction formed bythe yielding valve; a restriction nearer the inlet to said passage (thanthe yielding valve; and an air passage leading to the well from thesuction passage at 'a point bctween-thc yielding valve and thelast'namcd restriction.

8. In a carburetor, the combination of'a suction passage: a throttlevalve in 'Said passage; a yielding. valve 'in said passage nearer theinlet than the throttle valve; a fuel well; means for delivering fuel tosaid well/from a constant level; a spray nozzle leading from the well tothe restriction formed" hy the vielding valve; aV restriction nearer theinletthan the yielding valve, said yielding valve and restrictionmaintaining a substantially uniform velocity past the yielding valle;and an air passage leading to the well from the suction passage at apoint betivcen the yielding valve and the lust nunicd'rcstriction.

i). The combination of a primary carbureior comprising a first suctionpassage, and delivering fuel to the first suction passage; and asecondary carburetor comprising a second suction passage, afuel Well; aspray nozzle leading from the fuel well to the second suction passage;and means for delveringvair to the fuel well from the sec- Iii-stsuction passage; and a secondary saltcle, a second suction passage, agliel `ng valve opening only at a pre-determined solo tion 'in saidsecond suction passage greater than a functioning suction onthe'priinat.

carburetor, a fuel w'cll, a spray notizie lea if# ing from the fuel wollto tile restriction formed by the yielding valve, and means for i0delivering-aiuto the fuel-well. `11. l`li`e combination of a primarycarlmretoi' comprising a first fuel receptacle, a first suction passage,and means for deliver- 'ing fuel from the first fuel receptacle to thefirst 'suction passa-gegend a secondary carburetor comprising a secondfuel rece ta` cle, a second suction passage, a yiel ing valve openingonly 'at a predetermined suction in said` second suction passage'greater than a functioning suction on the prima carburetor, a iuelwell,a spray-nozzlerlea ing from the -fuel Well to the restriction formed bythe yielding valve, a restriction in the second suction passage nearertlio inlet than the yieldingwalf/e, and an air passage'leading from thesecond suction passage tothe feed well. #v

12. The combination oi 'a primary car buretor comprising a first fuelreceptacle, s

.3U first suction passage,'a nd means for delivern ing fuel from theirst fuel receptacle to the first suction passage; and a secondarycarburetor comprising a second fuel receptacle7 I a second suctionpassage, a yielding valve opening only at a predetermined suction insaid second suction passage greater than a functioning suction on theprimary' carburetor, a fuel well, Aa Aspray nozzle leading from the fuelwellto the restriction formedl 4" by the yielding valve, a restrictionin the second suction passage nearer the inlet than the yielding valve,and an air passage leadn ing to the Well from the second suction passageat -a point between the yielding Valve aa and the restrictionto the feedwell.

l 13. ln a durliiuretor, the combination of a main suction passage; athrottle valve in said.:

passage; a prn'nary carburetor discharging tossaid main suction passagecomprising a fuel receptacle, a first suction passage, and `means fordelii'ering fuel from the fuel le ceptacle to the first suction passage;and a secondary carburetor discharging to the main suction passage,comprisingv a second fuel receptacle, a second suction passage, a

\ yielding Valve opening only at a predetermined pressure in the mainsuction passage greater than a :functioning suction on the primarycarburetor. a fuel Well'. a spray n oz- Zle leading `from the .well totlierestrictton formed by the yieldingv valve. a restriction nearer theinlet to said second-*suction passage than the yielding Valve, and anair connection between the Well and said second onction. pai buretorcomprising a second i'usi rece' is@ cliaiygingoto giro fuer receptacieto the -f 'f sugo; and secondary sa `main suction passage; a throttleVais main ti said nas-sauge pricing :tust passage, and mean.

to the inain suction ing a secondi incl t1on passage,

is s

yielding salve opening ouiy .at a prefieterinznati pressure. in tiietnaii'i suction pass.n greater'tiiaa a functicniaa suction on t.carburetor, and. W means :tor delivering fueldroin the second receptacleto tl'ie restriction termed yielding 4valve at a point, the side i ivalve adjacent .to .the primary cassure 15. in a carburetor, thecombinatie passage; a, priirnaryv carburetor disc to said main suctionpassage cor-zip. fuel receptacle, first suction pas .es means *fordelivering fuel trom tile r ceptacle to tlie i'irst suction passar;secondary carburetor diselif'rg I main suction compi sin fuelreceptacle, a seefind sucti yielding saire ope mined pressure tl greaterthan a iiunctio .i primary carburetor, rituel Wea, zles leading fromsaid fuel "if striction formeel by tlie yieic tlie side oit said #faireadjaceii mary carburetor, 'a restriction suction passage nearer dieinn,J sage than the yielding valve, and .an nection between tlie'welland s suction 'passage between 'tile yiei and said restriction..

ld. a mais suction p. e; a titre ce said passage; a pr ary cariiuretoing a suction passage listing a ra the forni of a Venturi tube., a fueli zles leading from the fuel recept the fuel leirel. through the wallsor, tile coinii" turiiuloe and into .the'air cui y p` g throughthe-Venturi talee, an air sonner. .1an

o f v s I d ai' Krom sam sec-ono. fuel Well to the restriction :formedby the valve, a second fuel receptacle having e.. connection leading tosaid second well adaptedto feed fuel to thewell by graveonnection.fmtawme gtrictom f j rn' n, carburetor, the combination of a auction.'passa e having a closure shoulder thereon; n rave mounting adapted toform n eeem'e with sai fshoulder and to form a.

well between Hits* wallsfand the nelle of the suction passage; ayielding valve carried by the valve mounting; a spray nozzle arranged lv.

in the valve mounting andvleading from the. well to the restrictionformed by the yield-- ing valve; a restriction for the suction as sagecarried by the valve mounting; an an an" connection to the well havin anmlet between the yielding valve and t e reStI'ic-Vv tion carried by themounting. l In testimony whereof I have hereunto set my hand.

FRANK H. BALL.

